After Sunday's deadly shooting in Las Vegas, Lady Gaga calls it "terrorism plain and simple" while urging gun control legislation; months after the terrorist bombing at her Manchester concert, Ariana Grande shares a similar message.

Valerie Macon/AFP/Getty Images, Kevin Mazur/Getty Images

Following the deadliest mass shooting in American history, in which at least 58 people were killed and 500 wounded at a musical festival in Las Vegas on Sunday night, artists, actors and other celebrities from around the country are now using their platform in the hopes of advancing the conversation about gun control.

Since identified as Stephen Paddock, the shooter opened fire on a crowd from the 32nd floor of the Mandalay Bay hotel, stationed across the street from the outdoor venue where country singer Jason Aldean was performing at the time. The police uncovered at least 10 rifles in Paddock’s room, including hundreds of rounds of ammunition. Eric Paddock, the brother of the suspect, told reporters on Monday that Stephen Paddock legally owned “a couple” of handguns and may have owned one long gun, “but he had them in a safe.” It’s still unclear how Paddock came into possession of so many rifles.

In a ten-tweet-long thread, John Mayer laid out a passionate argument for immediate change with regards to gun control. “I’m going to state my thoughts without the words ‘gun control’ ‘assault rifles’ and others that stoke reflexive debate,” he began. “I’m a logic and reason guy. I like to remove emotion (impossible today) and look at an issue in a theoretical vacuum to make sense of it. Lawmakers and influencers: if you’re not doing everything in your power to at least *reassess* the threat of mass murder, why can’t you come out and tell us that this is the life we’re going to have to accept? That these are the new terms? That it’s a fact of modern day life that from time to time we’ll lose dozens of people in seconds? That daily life is a lottery system? And if you can’t say that, if it’s just too cold and brutal a thought to bear, then isn’t that proof you haven’t solved the problem yet?

He continue: “If you’re not at least trying to fix this, you’re effectively telling the country in your (in)actions that this somehow acceptable. There’s two moralities: morality identity and morality-in-action. Our greater moral identity doesn’t match our actions so far.9) If you’re not open minded to solving this, you’re morally surrendering us all to a very certain fate. There is no in between here. **Please use the energy normally allotted to fighting this argument to rethinking this problem.** Unless you don’t think there is one…”

Billy Eichner was likewise outspoken. After tweeting “enough already” in all caps, the Difficult People and American Horror Story: Cult star questioned why congress hasn’t been pushed more on the matter since Sandy Hook.

Lady Gaga shared a similar message, asking Democrats and Republicans to unite to bring an end to “terrorism.” She then directed a tweet towards Paul Ryan and Donald Trump, urging them to “act quickly” on gun control.

Mark Ruffalo (as well as Julianne Moore, in a similar message) encouraged everyone to join the movement to end gun violence by texting Everytown for Gun Safety, an organization that works with lawmakers to pass “common-sense laws and policies that save lives.”

Today we mourn for Las Vegas, tomorrow we fight for them.Join the movement to end gun violence: Text ACT to 64433. pic.twitter.com/yNmPeBjrFB